Lime-kiln.



13.1. DAUERNHEIIVI.

LIME KILN.

APPucATmN F|LED`1UNE21,1915.

Patvned Sept. 25, 1917.

3 SHEETS-SHEET l.

P. J. DAUERNHEIM.

LIMEl KILN,

APPLICATION FILED IUNEZI, I9I'5.

4,950. Ptemed sept.. 25, 1917.

3 SHEETS-SHEET 2. @9g

lllllVlED STT@ PATENT FFlE@ HILIP J. DA'UEBNHEIM, O'E ST. LOUIS,MISSOURI.

LIME-KLN;

Application filed .Tune 21, 193.5.

act description, reference beine, had to the accompanying drawings,forming a part hereof.

My invention relates to improvements 1n lime kilns, and is especiallydirectedto the construction of an internal furnace for a stack kiln.

Such internal furnaces areusually constructed of fire brick or otherrefractory material, best adapted to such usefby reason of their`Qualities to absorb a minimum of vheatunits and thus afford a maximum ofburned' lime rock to a given amount of fuel. However, vsuch materials,due to the intensity of` heat involved, are' of relatively short life,

and it is the object of my improvements to combine with an internalfurnace constructed of lire brick or analogous material a water coolingsystem which renders the maten rial of the furnace more capable ofwithstanding the intense heat, to the end that the furnace isgivenvadditional life and is less subject to the need of repair. In thearrangement of the various parts of the cool.-AV ingg system in theinternal furnace, my first' consideration has been the protection of thefurnace against the heat, but, .of course, hot

water and some steam are made and these may be drawn olf as desired, thesteam di rected'to aiding` the combustion of the fuel used, or to otherpurposes, and the hot water directedto its common usages.

lith the above and other objects in view, my invention consists incertain novel features of the construction andzarrangement of parts,hereinafter fully set forth, pointed out in my claims and illustratedbythe accompanying drawings, in which:

Figure l is a sectional elevation showing' a water cooling system in-aninternalfurnace installed'in a stack kiln, according to my invention;

Fig. 2 is a view similar tollig. l, and is taken at right anglestheretogz Fig, 3 is a fragmentary elevation of the kilnw embracing thatportion containing theY furnace and my improved water cooling systemtherefor; and

Specification of Letters latent.

` stacklO above the cooler chamber 6.

Patented Sept. 25, 19t '7.

semaine. 35,395.

Fig. 4l is a sectional plan taken on the line f-/l of Fig. 3.

ln this specification and upon the drawings like reference numerals areemployed t0 designate the various parts andr 5 designates the` base ofthe kiln structure, which has formed therein the lime cooling` and drawsing chamber, beneath which chamber 6 the structure is arched for thepurpose of form-y ing` a passageway 7 beneath the chamber 6 for wagons,trucks andthe like, which may be filled directly from the chamber 6. Thebottom Aof the chamber is provided with suit-- able easily operatedclosures, such as shown atS in. the drawings.

Themiddle upper portion of the chamber 6 is bridged by an arch 9, whichis of less width-than the chamber, so that the cham ber, at its sides,may communicate with thev Extended through the arch and having their.ends seated in the walls of the stack are the -f-beams 1l, upon whichand the arch 9 is supported the internal furnace, whose ends are formedbythe wallsv of the stack: and whose sides are formed by the walls 12built up fromthe arch 9and spaced from` the walls of the stack. Thesewalls havel greater thicknesses at their bottoms whereby to surround awater drum 13 in each wall in they immediate lvicinity of thel grates lewhich extend between the walls ofthe kiln and in the other direction.tol the walls of the furnace,r and divide the space between the furnacewalls into ash pits, 15,. separated by a grate-bridge 16, and a singlefuel and hre zone 17. As shown, the furnace has ak fuel door 1S andanashdoor 19 at each end...

Supported onthe furnace walls over thefirezone is the furnace top 20,whose sides.. converge. .upwardly so that the lime rock may movedownwardly from the stack. on

veach side-of the furnace, and this furnace'- topis of sufficient sizeto surround a centrally located water drumQl.

fit .intervals throughout the lengths of the vside walls of the furnacewalls are `the firey se.Y

Each of the drums projects through the kiln walls and each is provided,at at least one end with a man hole 25 for purposes of repair andcleaning.

Gutside the kiln structure I provide a steam dome 26 which connects withthe drum 21 by means of a pipe 27, including an expansion joint 28, andsaid steam dome connects with the drums 13 by means of pipes 29, each ofwhich includes an eXpansion joint 30.

Leading into each drumr 13 is a water feed pipe 31 connected at or nearone end and leading away from each drum, at or near their other ends, isa blow-off pipe 32.

Extending through the walls of the kiln in line with the furnace are thepoke holes 33, each of which has a suitable door 34,

' and in the kiln walls at right angles to the walls having the pokeholes 33 are the poke holes 35, having closures 36, in planes above thepoke holes 33.

By the construction shown and as just described, it is apparent that Ihave a stack kiln having a built in furnace within the stacky andarranged to have a fire zone in direct communication with the stack, sothat when in use the lime rock will surround the top and both sides ofthe furnace.

It is further apparent that the material, any of the known ceramics,entering into the furnace proper is uniformly protected against heat bywater so distributed as to place in the various parts ofthe furnace abody or volume of lwater proportionate with the dimensions of thefurnace parts. In other words, the base of the furnace at each side,where the burned lime stands, I place the drums 13 which contain bodiesof water sumcient to consume enough of the heat at this point to relievethe furnace of heat beyond a degree which it is designed to successfullywithstand.

In the side walls of the furnace, through which there are openingsformed to place the fire Zone in direct communication with the stack, Iplace the relatively small tubes 23, one tube being on each side of eachopening, and embedded in the wall, with a small area exposed to the fireZone. These side walls being relatively thin prohibit the use of largetubes containing large bodies of water, hence the partial exposure ofthe tubes to the fire to cause increased water circulation in the tubesand thus protect these thin walls against successive heat by arelatively small but rapidly circulated body of water instead of alarger, slowly circulated body7 of water as in the drums. These tubes inaddition to protecting the side walls from deterioration by heat, alsoact as a reinforcement for the same, which is made necessary by thethinness of the wall and the number of fire openings therein.

In the top of the furnace, which occupies a position in about the centerof the calcining zone of the stack, where the furnace is exposed to thegreatest heat, I place the drum 21, which is of a size to contain a muchlarger body of water than the other bodies referred to, whereby toabsorb sufficient of the heat to protect the upper furnace body. y

Having thus described my invention, what I claim as new therein anddesire to secure by Letters Patent of the United States therefor, is:

1. A lime kiln comprising an internal furnace constructed of ceramicmaterial, said furnace being provided with a fuel opening,

grate bars, ash pit, and whose side walls are spaced apart from thewalls of the kiln and provided with a series of fire holes eXtendingthroughout their length, a drum located on each side of the furnaceadjacent the` grate bars and partially in the heat zone, a drum ofgreater capacity than either of said drums located in the furnace abovethe combustion chamber, a series of tubes connect- ,ing the upper drumand the lower drums,

said tubes arranged adjacent to the fire openings and serve to protectthe side walls from deterioration by heat and acting as a reinforcementfor the same.

2. A lime kiln comprising an internal furnace constructed of ceramicmaterial, the walls thereof being provided with a series of openingsleading from the fire Zone, a horizontally disposed drum located belowthe grate bars and adjacent thereto in each side wall of the furnace, adrum of greater capacity than either of the first mentioned .drumshorizontally disposed in the arch of the furnace, a series of verticaltubes con' necting the lower drums with the upper drum, said verticaltubes being partially exposed to the heat of the combustion chamber,said drums protecting the furnace adjacent the grate bars from theexcessive heat and the vertical tubes likewise protecting the side wallsof the furnace from excessive heat and also acting as a reinforcementfor the side walls, and a steam drum located on the outside of the kilnand connected with said drums.

In testimony whereof, I have signed my name to this specification, inpresence of two subscribing witnesses.

, PHILIP J. DAUERNHEIM.

iVitnesses: Y

E. L. WALLACE, R. G. Omi/1G.

(Sonics of this ypatent may be obtained for ve cents each. by addressingthe Commissioner ni Patents.

' Washington, D. (2..

